In how many cases  ${\text{ΔS}}_{\text{system}}\text{>0}$
i) Reversible melting of solid benzene at 1 atm pressure& at the normal melting point.
ii) Reversible melting of ice at 1 atm & ${\text{0}}^{\text{°}}\text{C}$
iii) Reversible adiabatic expansion of ideal gas
iv) Reversible isothermal expansion of ideal gas
v) Adiabatic expansion of perfect gas in vacuum
vi) Reversible heating of perfect gas at constant pressure.
vii) Reversible cooling of perfect gas at constant volume.
viii) Irreversible adiabatic expansion of perfect gas.
ix) Mixing of some ideal gas in an isolated container.